Molecular & photodissociated gas in the massive star formation region NGC 6334

Astronomy and Astrophysics – Astrophysics

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Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Hii Regions, Emission And Reflection Nebulae, Origin, Formation, Evolution, Age, And Star Formation, Star Formation, Far Infrared

Scientific paper

We present mm and FIR wave spectroscopic observations of the southern star formation region NGC 6334. The cloud has been mapped in several transitions of CO, CS and NH3. The molecular emission shows a complex structure of bubbles and filaments. The bubbles in the CO emission, though devoid of molecular gas, are not empty. Instead, they are filled with photodissociated gas, as shown by the anticorrelation between the CO emission and the [C II] 158 μm emission. We find an anticorrelation between the 6 cm flux density from the H II regions and the intensity of the CS 7-->6 emission and NH3 (3,3) emission, which are dense gas tracers. We suggest that the continuum sources without dense gas emission have destroyed or dispersed any remnants of the dense gas from which they formed.

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